EP0634587B1 - Gaszylinder - Google Patents

Gaszylinder Download PDF

Info

Publication number
EP0634587B1
EP0634587B1 EP94500114A EP94500114A EP0634587B1 EP 0634587 B1 EP0634587 B1 EP 0634587B1 EP 94500114 A EP94500114 A EP 94500114A EP 94500114 A EP94500114 A EP 94500114A EP 0634587 B1 EP0634587 B1 EP 0634587B1
Authority
EP
European Patent Office
Prior art keywords
gas
ring
valve
valve plug
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94500114A
Other languages
English (en)
French (fr)
Other versions
EP0634587A1 (de
Inventor
Javier Barandiaran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gain Gas Technique SL
Original Assignee
Gain Gas Technique SL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gain Gas Technique SL filed Critical Gain Gas Technique SL
Publication of EP0634587A1 publication Critical patent/EP0634587A1/de
Application granted granted Critical
Publication of EP0634587B1 publication Critical patent/EP0634587B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • This invention relates to gas cylinders of the type normally used to regulate seats.
  • These cylinders are composed of two concentric tubes, of which the inner one is occupied by a piston operated by a ram or plunger.
  • the space between the tubes is occupied by a gas and this gas travels from the interior of the inner cylinder to both sides of the piston, through gas passages or holes cut in a valve plug and in a shaft plug.
  • a gas cylinder of this type is described in Patent Application ES.9001140 (FR-A-2 661 229), which presents the valve plug and the shaft plug based on three parts which are assembled together.
  • the valve plug formed, by means of two of its components, the passage for the gas between the inter-tube chamber and the piston, through the valve shaft, which means that it was not necessary to make any kind of holes to provide this necessary passage.
  • valve plug was composed of three components assembled together, which meant that there was the risk, on some occasions, of these parts working loose and making the cylinder unusable.
  • One object of the invention is to provide a gas cylinder with a valve plug consisting of only two parts fitted together by pressure, between which a passage for gas is formed, communicating the inter-cylinder space with the valve shaft, with the gas passage being in a broken line with at least three angles of 90 o each.
  • a second object of the invention is the provision of a circular or ring-shaped rabbet on the upper end of the lower stop of the valve shaft, where the O-ring gasket is fitted.
  • a third object of the invention is the forming of lugs on one of the two components that make up the valve plug.
  • a final object of the invention is the provision of a double slot in one of the components that make up the valve plug.
  • the invention provides a gas cylinder according to the features of claim 1.
  • a valve plug consisting of two cylindrical components connected together by pressure, of which the lower one has one lower portion of a diameter that fits into the inner tube and another upper portion of a diameter that fits into the outer tube.
  • the diameter of the upper component corresponds to that of the outer tube.
  • Both components have holes in their centres to allow the valve shaft to pass through, and are provided with the corresponding ring-shaped slots to house circular seals or gaskets.
  • the upper end of the lower part has a protruding neck, which is housed in the corresponding recess in the upper part.
  • This lower part is provided with a superficial slot cut in a radial plane of the part, a slot which starts at the hole for the valve shaft to pass through, passes along the top and side of the protruding neck and continues in a horizontal line and then down the vertical side surface of the part.
  • the slot in question finishes exactly where the portion that fits into the outer tube ends, which means that this slot communicates with the inter-chamber space.
  • the slot provides a gas passage from the said space to the hollow interior of the part.
  • the slot creates an internal channel that has three 90 o bends or turn between one end and the other, and the gas collides with the walls, slowing down the speed at which it circulates, which produces a tendency to balance the lowering and raising stresses of the piston and make them more in accordance with each other.
  • a plate-type metal washer is situated, by way of a protective shield to prevent the deformation of the said parts, which are usually made of injected plastic.
  • valve shaft that passes through the interior of both parts is provided with an end in the form of a washer, above which an O-ring gasket is fitted.
  • This washer is housed in a recess in the lowest portion of the lower part, pressing the O-ring seal so as to block the passage of gas between the area above the piston and the inter-cylinder space, through the previously mentioned angled slot that forms the gas passage.
  • valve shaft is operated by a conventional ram or pusher, so that its movement is axial and opens the passage for the gas, on releasing the washer and the O-ring gasket from its connection with the intake if the lower part.
  • the washer is provided with a circular rabbet or offset cut around the whole of its top edge.
  • This rabbet allows the gasket to be inserted further into the cavity in the lower part of the valve plug, with which an amount of dead stroke or safety travel, during which the cylinder does not operate, is achieved.
  • This aspect of the invention is very important and advantageous for the assembly and operation, because it prevents the cylinder for remaining pushed down once the assembly has been carried out, and therefore eliminates the risk that the passage for the gas does not remain open. A greater of lesser degree of safety will be achieved, depending on the dimensions of the circular rabbet.
  • a gas cylinder composed of a pusher (1) arranged inside the casing (2), which pushes the valve shaft (6).
  • the casing (2) rests on the plate-type washer (3) fitted on top of the valve plug.
  • the cyliner is composed of the two tubes (A, B), between which a chamber (C) occupied by gas is formed.
  • the gas can travel through two routes, one is throuhg the passage (7) towards the part above the piston (8') and the other is through the passage (11) in the shaft plug (10) towards the part below the piston (8'), so that according to where the piston is situated, the gas will occupy the position above or below the chamber (9).
  • valve plug consists of two parts (4 and 5) (Fig. 2), while the shaft plug consists of three parts (12, 13 and 14) (Fig. 3), assembled together.
  • the upper one (4) receives the plate-type washer (3) on its top (18) to act as a shield, and it has been hollowed out to make it lighter and save material.
  • the protuberance (16) from the lower part (5) in such a way that when both parts (4 and 5) are assembled together, they form the valve plug.
  • Figures 1 and 2 show the shape of the slot (7) cut radially into the part (5), that runs open to the exterior with the three said sharp angles in it, and communicating, as can be perceived, the space between cylinders with the centre of the part (5) through which the valve shaft passes.
  • the slot forms a totally closes channel except at its ends.
  • the depth or cross-section of the slot in the part (5) can be modified in order to vary the speed of the gas passing through it.
  • Figure 4 shows the part (5) before its lower portion has been machined to provide the two circular recesses (8), as illustrated in Fig. 2, in which gaskets or seals will be housed, as shown in Fig. 1.
  • Figure 7 shows the end washer (24) that closes the valve shaft (6) and on whose upper face an O-ring gasket is received, both of which are responsible for opening and closing the passage of gas through the slot (7) when the shaft is moved axially during the operation of the cylinder.
  • Fig. 7 Also prominent in Fig. 7 is the circular rabbet (27), which allows the O-ring gasket to be inserted further into the lower cavity (15) in the part (5) in order to provide an amount of dead stroke or safety travel.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Safety Valves (AREA)
  • Valve Housings (AREA)

Claims (3)

  1. Ein Gaszylinder bestehend aus zwei konzentrischen Zylindern (A, 8) mit einem Abstand (C) zwischen beiden, mit einem kolben (8') in seinem Inneren bzw. in der kammer des inneren Zylinders, der die kammer in zwei Bereiche trennt, wobei der innere Raum durch ein Gas gefüllt ist, das in dem besagten Innenraum in Richtung der beiden, durch den kolben geformten kammern durch die entsprechend in einem Anschlussventil (5) und einem Schaftventil (14) angeordneten Durchgänge wandert, wobei das Anschlussventil, das aus zwei Teilen besteht, und das Schaftventil, das aus drei Teilen besteht, mittles Druck zusammengesetzt sind, wobei sich zwischen beiden der obere Gasflussdurchgang in Richtung des Durchfluss- oder Umgehungsventils befindet, wobei dieses ein senkrechter Schaft ist, der in einem ringförmigen Rand oder Überstand, der eine O-Ring-Dichtung aufnimmt, endet, dadurch gekennzeichnet, dass das Anschlussventil (5) aus zwei zylindrischen Teilen (4, 5), die mittels Druck zusammengesteckt sind, bestehend aus einem oberen Teil, das auf seiner Oberseite eine Schutzvorrichtung (3) aufnimmt, und einem unteren (5), das in dem ersteren mittels eines Kragens (16) eingepasst ist, wobei der untere Teil (5) über die Länge der Anlage mit dem äusseren Rohr und der Verbindung zu dem oberen Teil einen Kanal oder Schlits (7) mit mindestens drei 90-Grad-Winkeln hat, der entsprechend einer senkrechten radialen Ebene geschnitten ist und die hohle Mitte, in der sich der Schaft des Ventils (6) bewegt, mittels eines oberen, geraden Abschnittes des besagten Schlitzes erreicht mit einem Dichtring (24), der das untere Ende des besagten Ventilschaftes (6) bildet, wobei eine ringförmige Fuge (27) in die äusseren kante der oben liegenden Oberfläche eingeschnitten ist, deren Lage sich unterhalb der für die Aufnahme der 0-Ring-Dichtung vorgesehenen befindet.
  2. Gaszylinder gemäß Anspruch 1 dadurch gekennzeichnet, dass der untere Teil (5) der beiden Teile, die das Anschlussventil ausmachen, mit einer Anzahl von Laschen oder Höckern (22) auf dem Teil seiner Oberfläche versehen ist, der in dem Inneren des äusseren Zylinders aufgenommen wird.
  3. Gaszylinder gemäß Anspruch 1 dadurch gekennzeichnet, dass der untere Teil der beiden Teile, die das Anschlussventil ausmachen, mit zwei ringförmigen Vertiefungen, die in die Oberfläche des Bereiches, der in dem Rohr aufgenommen wird, geschnitten sind und die jeweils O-Dichtringe aufnehmen, versehen ist.
EP94500114A 1993-06-25 1994-06-24 Gaszylinder Expired - Lifetime EP0634587B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9301437 1993-06-25
ES9301437 1993-06-25

Publications (2)

Publication Number Publication Date
EP0634587A1 EP0634587A1 (de) 1995-01-18
EP0634587B1 true EP0634587B1 (de) 1997-10-22

Family

ID=8282351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94500114A Expired - Lifetime EP0634587B1 (de) 1993-06-25 1994-06-24 Gaszylinder

Country Status (6)

Country Link
US (1) US5516082A (de)
EP (1) EP0634587B1 (de)
CN (1) CN1053096C (de)
BR (1) BR9402514A (de)
CA (1) CA2125757C (de)
DE (1) DE69406367T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9325345D0 (en) * 1993-12-10 1994-02-16 Dev Enterprises Limited Gas springs
IT1293250B1 (it) * 1997-07-17 1999-02-16 Nerio Righi Colonna ad aria compressa, ammortizzata e girevole, particolarmente per sedie da ufficio.
DE19756557A1 (de) * 1997-12-18 1999-08-05 Krautkraemer Hermann Gasfeder
DE60009271T2 (de) * 1999-11-04 2004-08-26 Gain Gas Technique, S.L. Gaszylinder
ES2251853B1 (es) * 2001-03-23 2007-06-16 Gain Gas Technique, S.L. Cilindro a gas de doble camisa.
CN1297761C (zh) * 2004-11-17 2007-01-31 楼红卫 一种磁化避震器
US20130119330A1 (en) * 2011-11-11 2013-05-16 Lewmar Limited Winch

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1812282C3 (de) * 1968-12-03 1981-07-30 Fritz Bauer + Söhne oHG, 8503 Altdorf Hubvorrichtung zum stufenlosen Höhenverstellen von Tischplatten, Stuhlsitzen u.dgl.
DE2225342C3 (de) * 1972-05-25 1978-10-12 Suspa-Federungstechnik Fritz Bauer & Soehne Ohg, 8503 Altdorf Längenverstellbare Gasfeder
US4386760A (en) * 1980-07-18 1983-06-07 Hutton Albert J Self-tailing winch
DE3446408C2 (de) * 1984-12-20 1989-06-29 Günther 7307 Aichwald Hahn Blockierbare Gasfeder
FR2586771B1 (fr) * 1985-08-28 1990-02-02 Socalfram Ressort pneumatique blocable
DE8524995U1 (de) * 1985-08-31 1985-10-10 Fritz Bauer + Söhne oHG, 8503 Altdorf Längenverstellbare Gasfeder
DE3602441A1 (de) * 1986-01-28 1987-07-30 Bauer Fritz & Soehne Ohg Laengenverstellbare gasfeder mit permanent-ausloese-einrichtung
DE3913849A1 (de) * 1989-04-27 1990-10-31 Stabilus Gmbh Sitzmoebel, insbesondere buerostuhl
DE4009034A1 (de) * 1990-03-21 1991-09-26 Suspa Federungstech Laengenverstellbare gasfeder
ES2024193A6 (es) * 1990-04-23 1992-02-16 Talleres Gain S Coop R L Cilindro a gas.

Also Published As

Publication number Publication date
CN1101101A (zh) 1995-04-05
CN1053096C (zh) 2000-06-07
DE69406367T2 (de) 1998-05-28
EP0634587A1 (de) 1995-01-18
CA2125757A1 (en) 1994-12-26
DE69406367D1 (de) 1997-11-27
US5516082A (en) 1996-05-14
BR9402514A (pt) 1995-01-24
CA2125757C (en) 2006-05-30

Similar Documents

Publication Publication Date Title
US4360192A (en) Gas spring, filling and sealing structure
US3489130A (en) Piston and cylinder construction
US4438833A (en) Piston for a pneumatic, hydraulic, or hydropneumatic installation
EP0344785B1 (de) Gasfeder mit mehreren hintereinander angeordneten Druckräumen
US5072812A (en) Hydraulic shock absorber
GB2188697A (en) Double-tube vibration damper
KR890009669A (ko) 유압식 충격 흡수기
US3038458A (en) Internal combustion engines and pistons therefor
EP0896174B1 (de) Kolbenring für Dämpfungselemente
EP0634587B1 (de) Gaszylinder
US5187934A (en) Tandem type master cylinder
USRE21908E (en) Shock absorber
CA2266407A1 (en) Gate valve seat
US3405697A (en) Hollow valve construction for variable compression ratio piston
WO1997011295A1 (en) A piston ring for a piston in an internal combustion engine
US4989498A (en) Hydraulic actuator
CN1989364A (zh) 可去联锁的止回阀
GB2277571A (en) Elastomeric shock absorber
KR100754536B1 (ko) 조립 피스톤을 구비하는 내연 기관
US5570763A (en) Suspension strut
GB2159917A (en) An hydraulic damper with adjustable valve
GB1566571A (en) Piston for use in a variable-compression-ratio internal combustion engine
JPH08338303A (ja) シールされた連結式ピストン
US3704695A (en) Valve construction for variable compression ratio piston
CA2097466C (en) Annular valve for a piston compressor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT PT

17P Request for examination filed

Effective date: 19950711

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19970108

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: GAIN GAS TECHNIQUE, S.L.

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT PT

REF Corresponds to:

Ref document number: 69406367

Country of ref document: DE

Date of ref document: 19971127

ITF It: translation for a ep patent filed
ET Fr: translation filed
REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 19980122

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 20030617

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030623

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20040621

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041224

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050228

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20041224

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050624

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050624

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050825

Year of fee payment: 12

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20050624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070103